\begin{tikzpicture}
    \tkzDefPoints{0/0/B, 3/0/C, 1.2/2.5/A, 2.5/2.5/D}
    \tkzDefMidPoint(A,B)  \tkzGetPoint{M}
    \tkzDefMidPoint(D,C)  \tkzGetPoint{N}
    \tkzInterLL(A,N)(B,C)  \tkzGetPoint{E}
    \tkzDrawPolygon(A,B,C,D)
    \tkzDrawSegment(M,N)
    \tkzDrawSegments[dashed](A,E  C,E)
    \tkzLabelPoints[left](A,B,M)
    \tkzLabelPoints[right](D,N,E)
    \tkzLabelPoints[below](C)
\end{tikzpicture}

